Isu Razi Pass

Isu Razi Pass cycling climb profile

Isu Razi Pass is short enough to look manageable on paper, but the key number is not the 2.6 km length. It is the 12.5% average gradient. Over that distance, an average this high means the climb should be treated as a sustained effort rather than a rolling ascent with obvious places to reset.

The profile starts at 1352 m and tops out at 1679 m, with a listed net elevation gain of 327 m. The maximum gradient is 14.62%, which is not dramatically above the average. That tells you something important about the ride feel: this is not a climb where one isolated wall creates the difficulty. The whole climb is steep, and the hardest sections are likely to feel like an extension of the same pressure rather than a separate event.

How the gradient unfolds

With only 2.6 km to climb, the temptation is to attack it like a hard interval. That is risky here because 12.5% does not give much back. If the road sits close to its average for long stretches, even a small over-pacing error in the opening minutes can force you into low-cadence survival before the summit.

The listed max of 14.62% suggests the steepest ramps are only a couple of percentage points above the climb average. Practically, that means the difficulty is not about reacting to one brutal pitch. It is about holding traction, cadence, and breathing under continuous load.

Pacing and gearing notes

Ride the first section under control, closer to a hard threshold effort than an all-out surge. If you know your /glossary/ftp, this is a climb where pacing by feel can drift high very quickly because speed will be low and torque demand will be high.

Gearing matters more than bravado. A compact climbing setup or a wide-range cassette is the smart choice, not because the climb is long, but because the average gradient leaves little room to recover from grinding. The goal is to preserve cadence on the 12.5% body of the climb and still have a gear left when the road reaches the 14.62% maximum.

Data note

The supplied profile lists 327 m of net elevation gain and 256 m of total ascent, which do not align cleanly. For ride planning, the most useful anchors are the 2.6 km length, 12.5% average gradient, and 14.62% maximum gradient. Those three figures describe the essential challenge: short, steep, and consistently demanding.